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120 results on '"Izumi, Makoto"'

4. 20‐3: Invited Paper: Characteristics of Cadmium‐free Blue NanoLEDs with Protection Technology Applied to Quantum Dots.

Author

Fukunari, Yuki, Naka, Takayuki, Ishida, Takeshi, Iwata, Noboru, Izumi, Makoto, DaRos, Jeffrey, Kan, Shihai, and Ippen, Christian

Subjects
QUANTUM dot devices, ELECTROLUMINESCENT devices, QUANTUM efficiency, ELECTROLUMINESCENCE, QUANTUM dots, ACHIEVEMENT
Abstract

The nanoLED, an electroluminescent device utilizing quantum dots (QDs), is expected to be a promising candidate for the next‐generation display. This paper presents a newly developed QD protection technology for cadmium‐free nanoLEDs that enables simultaneous achievement of high‐efficiency electroluminescence (EL) and long lifetime. The device which was prototyped by applying ZnSeTe blue QDs to an emissive layer demonstrated a maximum external quantum efficiency (EQE) of 21.0% and a luminance half‐lifetime (LT50) of 128,000 hours at 100 nits. These results indicate that cadmium‐free nanoLEDs can meet the requirements for display application in terms of both EL efficiency and reliability. [ABSTRACT FROM AUTHOR]

Published
2024
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6. 20‐3: Invited Paper:Characteristics of Cadmium‐free Blue NanoLEDs with Protection Technology Applied to Quantum Dots

Author

Fukunari, Yuki, Naka, Takayuki, Ishida, Takeshi, Iwata, Noboru, Izumi, Makoto, DaRos, Jeffrey, Kan, Shihai, and Ippen, Christian

Abstract

The nanoLED, an electroluminescent device utilizing quantum dots (QDs), is expected to be a promising candidate for the next‐generation display. This paper presents a newly developed QD protection technology for cadmium‐free nanoLEDs that enables simultaneous achievement of high‐efficiency electroluminescence (EL) and long lifetime. The device which was prototyped by applying ZnSeTe blue QDs to an emissive layer demonstrated a maximum external quantum efficiency (EQE) of 21.0% and a luminance half‐lifetime (LT50) of 128,000 hours at 100 nits. These results indicate that cadmium‐free nanoLEDs can meet the requirements for display application in terms of both EL efficiency and reliability.

Published
2024
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11. A Case of Left Ventricular Contractile Dysfunction with Complete Atrioventricular Block During Administration of Dabrafenib Plus Trametinib in Which Treatment Was Able to Be Continued with Dabrafenib Alone

Author

Hosoya, Ryusaku, primary, Sakashita, Hiroyuki, additional, Yamada, Takayuki, additional, Sawada, Atsushi, additional, Kumagai, Takashi, additional, Izumi, Makoto, additional, Watabe, Haruna, additional, Kamoshida, Tatsuhiko, additional, Yasuda, Takehiro, additional, and Tominaga, Shinichiro, additional

Published
2023
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16. 8‐3: Development of Highly Efficient RGB Cadmium‐Free Quantum‐Dot Light‐Emitting Diodes

Author

Ryowa, Tatsuya, primary, Sakakibara, Yusuke, additional, Yamamoto, Satoru, additional, Kitano, Keisuke, additional, Iwata, Noboru, additional, Izumi, Makoto, additional, Ogura, Yuko, additional, Michiwaki, Yoko, additional, Nikata, Soichiro, additional, Mishima, Akio, additional, Kalousek, Vit, additional, Takasaki, Mikihiro, additional, and Miyanaga, Akiharu, additional

Published
2022
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17. Evaluation of degradation behavior in quantum dot light-emitting diode with different hole transport materials via transient electroluminescence

Author

Doe, Takahiro, primary, Kitano, Keisuke, additional, Yamamoto, Satoru, additional, Yamamoto, Masaki, additional, Goto, Kazuki, additional, Sakakibara, Yusuke, additional, Kobashi, Tadashi, additional, Yamada, Hirohisa, additional, Ueda, Masaya, additional, Ryowa, Tatsuya, additional, Izumi, Makoto, additional, and Arakawa, Yasuhiko, additional

Published
2021
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19. 65‐3: Quantum Dot Light‐emitting Diodes with High Color Purity RGB Cadmium‐Free Quantum Dots

Author

Ryowa, Tatsuya, primary, Sakakibara, Yusuke, additional, Kobashi, Tadashi, additional, Kitano, Keisuke, additional, Ueda, Masaya, additional, Izumi, Makoto, additional, Ogura, Yuko, additional, Michiwaki, Yoko, additional, Nikata, Soichiro, additional, Mishima, Akio, additional, Kalousek, Vit, additional, Takasaki, Mikihiro, additional, and Miyanaga, Akiharu, additional

Published
2021
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22. Development of Efficient Blue Cadmium-Free Quantum Dot Light-Emitting Diodes

Author

Ryowa, Tatsuya, primary, Sakakibara, Yusuke, additional, Kitano, Keisuke, additional, Ueda, Masaya, additional, Izumi, Makoto, additional, Ogura, Yuko, additional, Tanaka, Masanori, additional, Nikata, Soichiro, additional, Watanabe, Mayuko, additional, Takasaki, Mikihiro, additional, Itoh, Tetsuji, additional, and Miyanaga, Akiharu, additional

Published
2020
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24. 58‐3: Distinguished Paper: High‐Efficient Quantum‐Dot Light‐Emitting Diodes with Blue Cadmium‐free Quantum Dots

Author

Ryowa, Tatsuya, primary, Ishida, Takeshi, additional, Sakakibara, Yusuke, additional, Kitano, Keisuke, additional, Ueda, Masaya, additional, Izumi, Makoto, additional, Ogura, Yuko, additional, Tanaka, Masanori, additional, Nikata, Soichiro, additional, Watanabe, Mayuko, additional, Takasaki, Mikihiro, additional, Itoh, Tetsuji, additional, and Miyanaga, Akiharu, additional

Published
2020
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25. High‐efficiency quantum dot light‐emitting diodes with blue cadmium‐free quantum dots

Author

Ryowa, Tatsuya, primary, Ishida, Takeshi, additional, Sakakibara, Yusuke, additional, Kitano, Keisuke, additional, Ueda, Masaya, additional, Izumi, Makoto, additional, Ogura, Yuko, additional, Tanaka, Masanori, additional, Nikata, Soichiro, additional, Watanabe, Mayuko, additional, Takasaki, Mikihiro, additional, Itoh, Tetsuji, additional, and Miyanaga, Akiharu, additional

Published
2020
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30. 64‐1: Invited Paper:Challenges for Realizing QD‐LED Display

Author

Kanehiro, Masayuki, Nakanishi, Yohei, Ishida, Takeshi, Ryowa, Tatsuya, Izumi, Makoto, Iwata, Noboru, Asaoka, Yasushi, Kamada, Tsuyoshi, and Berryman-Bousquet, Valerie

Abstract

This paper reports on the potential of quantum dot light emitting diode (QD‐LED) as a future display technology and on the advances required to realize it. We give an update on development of QD materials, lifetime and UV lithography‐based fabrication process for active matrix QD‐LED displays.

Published
2021
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31. Detection of spins and charge states in centrosymmetric materials by nonlinear optics

Author

Satoh, Takuya, Lottermoser, Thomas, Fiebig, Manfred, Ogimoto, Yasushi, Tamaru, Hiroharu, Izumi, Makoto, and Miyano, Kenjiro

Subjects
Dielectric films -- Research, Thin films -- Research, Magnetic fields -- Research, Physics
Abstract

Nonlinear optics is applied to two types of centrosymmetric magnetic materials and shown to be a powerful complement to linear optics. The interfaces of centrosymmetric thin films on manganite heterostructure by interface-sensitive second harmonic generation are investigated.

Published
2005

33. 58‐3: Distinguished Paper:High‐Efficient Quantum‐Dot Light‐Emitting Diodes with Blue Cadmium‐free Quantum Dots

Author

Ryowa, Tatsuya, Ishida, Takeshi, Sakakibara, Yusuke, Kitano, Keisuke, Ueda, Masaya, Izumi, Makoto, Ogura, Yuko, Tanaka, Masanori, Nikata, Soichiro, Watanabe, Mayuko, Takasaki, Mikihiro, Itoh, Tetsuji, and Miyanaga, Akiharu

Abstract

We report outstanding electroluminescence properties of high efficient blue cadmium‐free quantum dot light emitting diodes (QD‐LED). External quantum efficiency (EQE) of 14.7% was achieved for QD‐LED emitting at 428nm. Furthermore we developed high efficiency and narrow wavelength emission Zinc Selenide (ZnSe) nanocrystals emitting at 445nm and achieved QD‐LED with an EQE of 10.7%. These new QDs have great potential to be used in next generation QD‐LED display with wide colour gamut.

Published
2020
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36. 54‐1: Invited Paper:Development of Electroluminescent QD‐LED Displays

Author

Smeeton, Tim M., Angioni, Enrico, Boardman, Edward A., Izumi, Makoto, Iwata, Noboru, Nakanishi, Yohei, and Ishida, Takeshi

Abstract

This paper reports on the potential of electroluminescent quantum dot LED (QD‐LED) as a future display technology and on the advances required to realise this potential. We give an example of progress in development of a UV lithography‐based fabrication process for QD‐LED devices.

Published
2019
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41. Energy gap formation in the valence fluctuating compound CeIrSb probed by Sb NMR and NQR

Author

Kawasaki, Yu, Izumi, Makoto, Kishimoto, Yutaka, Ohno, Takashi, Tou, Hideki, Inaoka, Yoshihiko, Sera, Masafumi, Shigetoh, Keisuke, Takabatake, Toshiro, Kawasaki, Yu, Izumi, Makoto, Kishimoto, Yutaka, Ohno, Takashi, Tou, Hideki, Inaoka, Yoshihiko, Sera, Masafumi, Shigetoh, Keisuke, and Takabatake, Toshiro

Abstract

Sb NMR and NQR studies have revealed the formation of a pseudogap at the Fermi level in the density of states in a valence fluctuating compound CeIrSb. The nuclear spin-lattice relaxation rate divided by temperature, 1/ T1 T, has a maximum around 300 K and decreases significantly as 1/ T1 T∼ T2, followed by a 1/ T1 T=const relation at low temperature. This temperature dependence of 1/ T1 T is well reproduced by assuming a V-shaped energy gap with a residual density of states at the Fermi level. The size of energy gap for CeIrSb is estimated to be about 350 K, which is by 1 order of magnitude larger than those for the isostructural Kondo semiconductors CeRhSb and CeNiSn. Despite the large difference in the size of energy gap, CeIrSb, CeRhSb, and CeNiSn are indicated to be classified into the same group revealing a V-shaped gap due to c-f hybridization. The temperature dependence of the Knight shift measured in a high magnetic field agrees with the formation of this pseudogap.

Published
2007

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